We are also having these issues with our robot.
On Tue, Oct 23, 2012 at 7:16 PM, Bob and Ann Henshaw <[log in to unmask]>wrote:
> I am a 5 year veteran home based coach with a 2nd year team of 10 year
> olds. We are working with a Mindstorms NXT system that we purchased new
> last year, with a fully recharged battery. We are experiencing several
> intermittent erratic behaviors (listed below) that is driving our team
> crazy. Please let us know if you have any debugging suggestions.****
> ** **
> Observed behaviors:****
> ** **
> **1. **After completing a planned series of instructions, with the
> last instruction having 2 wheels turning equally (straight line), the robot
> suddenly makes an additional turn (one motor, rotating robot about 30 -
> 40degrees). This occurs even after deleting the program, recompiling and
> redownloading it, and even after adding an all motor stop block to the
> program. Our team is referring to this as a ghost and are convinced that
> the robot is now haunted, just to get us in the Halloween mood. ****
> **2. **The robot, using a two wheeled turn (one motor going
> forward, one going backward) intermittently turns too far or too short.
> Programming is being done in rotations for both motors. Because both motors
> are running together, I canít tell if it is related to the problem above.
> This occurs about 1 in 5 runs.****
> ** **
> I do not think that this is a cable issue, as we are not seeing anything
> beyond the usual minor navigation errors due to lineup, wrinkles in the
> mat, etc. That leaves the motors and the NXT itself. Could this be a bad
> servo motor and if so, is there any way to test them? ****
> ** **
> Appreciate your suggestions!****
> Bob Henshaw****
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